Melt and pour soap warping

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Jan 6, 2017
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I poured some microwaved melted melt and pour soap into a rectangular mold. I waited for an hour before unmolding. It looked fine and just as I expected it to. Then progressively sometime over the next week I start to see the rectangular shape soap warp and bend. It distorts enough for me to notice and think it now looks ugly.

Any tips on what I did wrong, or what I can do right next time?

Thanks in advance.
What base did you use? I just asked my daughter who did m&p only for 6 yrs and is excellant at it. If you added any oils or butters which you really should not do it can cause warping. Other than that it could be a bad base with to much liquid in it. Usually on the manufacturers site they will have a list of acceptable percentages of any additives. If this is a craft store base I would guess bad base